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  • Defence Sector – DPP, Missions, Schemes, Security Forces, etc.

    INS Sahyadri–HMAS Ballarat in AUSINDEX 2025

    Prelims Only | International Relations | Mains Paper 2: Bilateral, Regional and Global Groupings and agreements involving India

     Why in the News?

    INS Sahyadri of the Indian Navy and HMAS Ballarat of the Royal Australian Navy participated in the AUSINDEX 2025 bilateral maritime exercise in the Northern Pacific, strengthening India–Australia defence cooperation and enhancing interoperability.

    What is AUSINDEX?  

    • Bilateral naval exercise between India and Australia
    • First held in 2015
    • Aims at maritime cooperation, interoperability, and security
    • Conducted alternately in India and Australia / designated oceanic regions

    AUSINDEX 2025 

    • Location: Northern Pacific
    • Participants:
    • INS Sahyadri – Shivalik-class guided-missile stealth frigate
    • HMAS Ballarat – Anzac-class frigate
    • Focus areas:
        • Anti-submarine warfare (ASW)
        • Gunnery drills
        • Advanced flying operations
        • Joint maritime manoeuvres
    • Objective: Boost interoperability and reaffirm commitment to a free, open, inclusive Indo-Pacific
    With reference to India’s defence, consider the following pairs: (2025)

    I. Dornier-228 : Maritime patrol aircraft 

    II. IL-76 : Supersonic combat aircraft III. C-17 Globemaster 

    III : Military transport aircraft 

    How many of the pairs given above are correctly matched? 

    (a) Only one 

    (b) Only two 

    (c) All the three 

    (d) None

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  • Internal Security Trends and Incidents

    DRI Seizes 32 kg Methamphetamine in North East

    Prelims Only | Security Issues | Mains Paper 3: Border Area Security Challenges,Organized Crime & Terrorism

    Why in the News?

    The Directorate of Revenue Intelligence (DRI) has seized 32 kg methamphetamine tablets worth ₹32 crore in two separate operations in Assam and Tripura, exposing the continued use of the Indo–Myanmar route for drug trafficking. Three persons have been arrested under the NDPS Act, 1985.

    About Methamphetamine  

    • A synthetic psychostimulant
    • Known as Ya Ba / Speed pills in Southeast Asia
    • Highly addictive
    • Controlled under Schedule of NDPS Act, 1985

    What is Hydroponic Weed?

    • Marijuana grown in nutrient-rich water systems, not soil
    • Higher potency due to controlled conditions
    • New smuggling trend: carried by air passengers into NE India

    NDPS Act, 1985  

    • Regulates narcotic drugs and psychotropic substances
    • Provides for seizure, arrests, forfeiture
    • Commercial quantity offences: 10–20 years imprisonment
    • Empowered agencies: DRI, NCB, Customs, State Police, BSF, Assam Rifles
    Q: India’s proximity to two of the world’s biggest illicit opium-growing states has enhanced her internal security concerns. Explain the linkages between drug trafficking and other illicit activities such as gunrunning, money laundering and human trafficking. What countermeasures should be taken to prevent the same? (UPSC 2018) 

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  • Dams and Hydroprojects

    HMDA to use bioremediation to clean up Hussainsagar lake

    Prelims Only | Enviro & Biodiversity | Mains Paper 3: Conservation, Environmental Pollution & Degradation, Eia

    Why in the News?

    The Hyderabad Metropolitan Development Authority (HMDA) has announced a new advanced bioremediation initiative using enzyme solutions and biochar-based Bokashi balls to clean and restore Hussainsagar Lake, which has long suffered from algal blooms, foul odour, sewage inflow, and industrial pollution.

    About Hussainsagar Lake

    • A 16th-century artificial lake in Hyderabad.
    • Faces severe pollution due to:
      • Sewage inflow
      • Nutrient overload (nitrates, phosphates)
      • Industrial waste
    • Problems: algal blooms, foul odour, low Dissolved Oxygen (DO), high Biochemical Oxygen Demand (BOD).

    What Is Bioremediation?

    • Definition: Use of microorganisms, enzymes, or biological materials to break down pollutants and restore ecosystems.
    • Types relevant here:
      • In-situ bioremediation – treating the lake onsite without removing water.
      • Bio-augmentation – adding microbial cultures to enhance degradation.
      • Aerobic/oxygenation systems – boost DO to improve water quality.

    New Intervention Planned by HMDA

    • Enzyme Solutions

        • Enhance microbial breakdown of organic pollutants.
        • Help reduce nutrient load responsible for algal blooms.

    • Bokashi Balls (with Biochar)

      • Bokashi = fermented organic matter rich in beneficial microbes.
      • Biochar:
        • Carbon-rich material produced from biomass.
        • Increases microbial activity, absorbs toxins, improves water clarity.
      • Purpose:
        • Reduce algae, odour, pathogenic bacteria.
        • Increase water transparency and DO levels.
    In the context of solving pollution problems what is/are the advantage/disadvantages of bioremediation technique? (2017)

    1. It is a technique for cleaning up pollution by enhancing the same biodegradation process that occurs in nature. 

    2. Any contaminant with heavy metals such as cadmium and lead can be readily and completely treated by bioremediation using microorganisms. 

    3. Genetic engineering can be used to create microorganisms specifically designed for bioremediation. 

    Select the correct answer using the code given below: 

    (a) 1 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3

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  • International Space Agencies – Missions and Discoveries

    Moss Spores Survive Months in Space

    Prelims Only | Enviro & Biodiversity | Mains Paper 3: Achievements Of Indians In S&T,Awareness in various sc and tech fields

    Why in the news?

    A recent study published in iScience revealed that moss spores (Physcomitrium patens) survived nine months outside the International Space Station (ISS), enduring vacuum, cosmic radiation, microgravity, and temperature extremes. Over 80% of the spores survived and successfully germinated on return to Earth. Scientists estimate moss could survive up to 15 years in space.

    Key Findings of the Study

    • 20,000 moss spores were placed outside the ISS in March 2022.
    • Exposed to: Vacuum, Cosmic radiation, Microgravity and Extreme temperatures
    • After 283 days, the spores were retrieved.
    • Results: 80% survived
      • Among survivors, 89% germinated successfully
      • Chlorophyll levels normal except a 20% drop in chlorophyll a, but not harmful
    • Survival attributed to multiple spore wall layers offering passive protection.

    About the Species

    • Species: Physcomitrium patens
    • Model organism for plant evolutionary studies
    • Mosses are one of the earliest land plants
    • Already known for surviving:
      • Antarctica
      • Volcanic fields
      • Deserts

    Why Moss Survived – Scientific Insight

    • Multiple thick-walled layers → physical shielding
    • Ability to remain in dormant state
    • Natural mechanisms to handle:
      • Radiation
      • Desiccation
      • Freezing and thawing cycles

    Why Is This Significant?

    • Implications for Space Exploration: 
        • Ability to survive harsh space environments → potential role in: Oxygen generation, Humidity control, Soil formation on Moon/Mars.
        • Supports concepts of bioregenerative life-support systems
        • It could be used in terraforming experiments on other celestial bodies

    • Astrobiology

        • Supports the idea that primitive plant life could survive interplanetary transport.
        • Relevant to panspermia hypothesis (life spreading across planets via spores).

    • Long-term Human Habitats

      • Moss can grow with minimal resources
      • Can contribute to:
        • Closed-loop ecosystems
        • Sustainable habitats
        • Psychological well-being in isolated environments (greenery)
    Consider the following statements: (2023)

    1. Some microorganisms can grow in environments with temperature above the boiling point of water. 

    2. Some microorganisms can grow in environments with temperature below the freezing point of water. 

    3. Some microorganisms can grow in highly acidic environment with a pH below 3. 

    How many of the above statements are correct? 

    (a) Only one (b) Only two (c) All three (d) None

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  • Health Sector – UHC, National Health Policy, Family Planning, Health Insurance, etc.

    [24th November 2025] The Hindu OpED: The future of health lies in harmony

    op-ed snap | Indian Society | Mains Paper 2: Health & Education

    PYQ Relevance

    [UPSC 2019] How is the Government of India protecting traditional knowledge of medicine from patenting by pharmaceutical companies?

    Linkage: Traditional medicine is gaining global traction, so protecting it from patenting and biopiracy is now a core policy priority rather than a cultural concern. As India leads the global traditional medicine agenda, this linkage makes the topic very likely to appear in future UPSC exams under health governance, IPR and soft-power.

    Mentor’s Comment

    The global health landscape is undergoing a paradigm shift. Traditional medicine, once seen as alternative, is now being recognised as a scientific and social asset. With India emerging as a hub of innovation and evidence-based traditional research, and hosting the Second WHO Global Summit on Traditional Medicine, the world is witnessing a renewed focus on health systems rooted in balance, sustainability and technology-enabled well-being.

    INTRODUCTION

    Health, in its original meaning, has always signified harmony, within the human body, and between humans and nature. With modern lifestyles driving chronic diseases, mental strain and ecological imbalance, traditional systems of medicine offer a rediscovered pathway to well-being that integrates mind, body, community, and environment. India, with its rich heritage of Ayurveda, Yoga, Unani, Siddha and Sowa-Rigpa, is repositioning traditional medicine as an engine of science-driven global healthcare transformation.

    WHY IN THE NEWS?

    The Second WHO Global Summit on Traditional Medicine hosted by India marks a watershed moment, for the first time, traditional medicine is being institutionalised globally as a scientific, evidence-backed and sustainable component of public health systems. With around 90% of WHO member-states reporting usage of traditional medicine, and India’s AYUSH market reaching USD 34.3 billion, global health priorities are shifting from reactive sick-care to proactive well-being. The Summit signals the beginning of a new chapter where traditional medicine integrates with modern technologies, data analytics and global governance.

    Why is traditional medicine gaining global significance?

    1. Escalating lifestyle diseases: rising non-communicable diseases demand preventive, holistic models of care.
    2. Fragmented systems failing: reactive, curative-centric models cannot ensure long-term public well-being.
    3. Biodiversity-nutrition-livelihood interlinkages: traditional medicine influences food security, sustainability and livelihoods.
    4. Affordability for LMICs: for billions across low- and middle-income regions, traditional medicine remains first access to healthcare.

    How is traditional medicine evolving from belief to science?

    1. Evidence-based research: WHO emphasises integration supported by data, learning and scientific validation.
    2. Shift from consumer preference to collective responsibility: well-being linked to shared ecosystems and sustainability.
    3. Recognition as a scientific and social asset: elevated at the 2023 WHO Summit in Gandhinagar.
    4. Institutional reforms in India: dedicated AYUSH department at BIS, and global standards under ISO/TC 249/SC 2.

    What is India’s leadership role in global traditional medicine?

    1. WHO Global Traditional Medicine Centre (GTMC) in Jamnagar: a knowledge hub for innovation, analytics and sustainability.
    2. Memorandum of Understanding with WHO: India co-hosts global Summit and participates in shaping global priorities.
    3. Political and scientific commitment: Prime Minister’s focus leads to increasing investments and ecosystem building.
    4. Vision of collective global stewardship: India positions traditional knowledge as shared global heritage.

    How does technology change future pathways of traditional medicine?

    1. Digital health and analytics: enable real-time monitoring, transparency and measurable clinical outcomes.
    2. Sustainability and biodiversity research: bridges traditional practice with ecological protection.
    3. Innovation-led scaling: makes traditional systems compatible with global regulatory and safety frameworks.
    4. Data-driven inclusion: ensures equitable access to health knowledge and solutions.

    How does the Summit reshape global health governance?

    1. Benefit sharing and fair access: ensures equitable utilisation of biological and cultural assets.
    2. Value of local heritage in globalisation: respects indigenous knowledge in global supply chains.
    3. Integration with modern health priorities: aligns traditional medicine with contemporary clinical and public health goals.
    4. Ethical anchoring of future innovation: technology with community-rooted ethics and sustainability.

    CONCLUSION

    The world is moving toward a health model where prevention, sustainability, community participation and science converge. Traditional medicine, empowered by research, technology and equitable access, offers a pathway to resilience against lifestyle diseases and global health inequalities. India’s leadership in steering this transformation reinforces health not as the absence of disease, but as a state of balance between humans and nature.

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  • Labour, Jobs and Employment – Harmonization of labour laws, gender gap, unemployment, etc.

    Labour codes: what changes for workers and employers

    Explained | Economics | Mains Paper 3: Issues relating growth and development, employment

    Introduction

    The four labour codes, Code on Wages, Code on Social Security, Industrial Relations Code, and Occupational Safety, Health and Working Conditions Code, aim to simplify compliance for industries, expand social security to workers, and improve ease of doing business. However, labour being a concurrent subject, implementation depends on states, and concerns have emerged about job security, worker rights, and the impact on collective bargaining.

    Why in the News

    The government has notified the implementation of four labour codes after over five years of deliberation and the consolidation of 29 central labour laws. This marks the first time India will operate under a uniform nationwide wage system and a consolidated social security architecture. While the reforms promise simplified compliance and a push for manufacturing efficiency, trade unions warn of reduced strike power, easier employee termination, and increased precarity for informal workers, making it one of the most debated labour reforms in recent times.

    Labour Codes and the Changing Labour Landscape

    1. Consolidation of 29 laws into four codes to create uniformity and remove overlapping provisions.
    2. Target shift from penal to compliance-based enforcement, especially for small firms and first-time offences.
    3. Push for economies of scale in manufacturing, signalling alignment with global production norms.

    Code on Wages: What changes for employees and employers?

    1. Uniform definition of wages: It ensures consistency in minimum wage calculation across states and sectors.
    2. Mandated national floor wage: It enables states to set minimum wages only above the national baseline.
    3. Time-bound wage payment: within 2 days of resignation/termination and 7 days of completion of the wage period.
    4. Broader coverage for all employees irrespective of industry or wage threshold.
    5. Overtime provisions strengthened: capped at 48 hours weekly, 12 hours daily shift duration permitted with breaks.

    Code on Social Security: Is the social net expanding?

    1. Unified ecosystem of social security: It covers unorganised, informal, gig, and platform workers for the first time.
    2. National Social Security Board: For recommendations, registration, schemes, and funding decisions.
    3. Corporate Co-contribution: Corporates may co-contribute to gig/platform worker benefits but funding split still unclear.
    4. ESIC expansion: Applies to sectors previously exempt; plantation workers included voluntarily.
    5. Formalisation incentive through maternity benefits, gratuity reforms, and inclusion of fixed-term employees.

    Industrial Relations Code: Does it limit collective bargaining?

    1. Stricter strike rules: 60-day notice before strike and prohibition of strike in the next 14 days of conciliation.
    2. Increase in threshold: Threshold for prior permission for layoffs raised from 100 to 300 workers, enabling easier hiring-firing.
    3. Negotiating Union provision: Only unions with 51% membership can negotiate; multi-union negotiation councils for fragmented memberships.
    4. Push for stable industrial climate: It is criticised for shrinking bargaining space for workers.

    OSH Code: Will workplace safety improve?

    1. Standardised norms: Across industries norms for working hours, workplace safety, and facility obligations.
    2. Mandatory free annual health check-ups: For workers in notified industries.
    3. Women allowed in all sectors and night shifts: subject to safety conditions.
    4. Increased accountability for establishments: In case of handling hazardous activities and migrant labour.

    Conclusion

    The labour codes aim to simplify compliance and strengthen India’s labour market to support manufacturing-led growth. However, concerns persist regarding job security, collective bargaining, and implementation across states. Successful outcomes depend on balancing economic flexibility with worker protection and ensuring that reforms lead to formalisation without vulnerability.

    PYQ Relevance

    [UPSC 2024] Discuss the merits and demerits of the four ‘Labour Codes’ in the context of labour market reforms in India. What has been the progress so far in this regard?

    Linkage: Growth driven mainly by labour productivity has led to GDP rising without proportional job creation. This links to the four Labour Codes, which seek higher productivity and flexibility, but face concerns on whether they will create jobs while protecting workers.

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  • How can State PSCs be reformed

    Explained | Polity | Mains Paper 2: Indian Constitution – historical underpinnings, evolution, features, amendments, significant provisions and basic structure

    Introduction

    Public Service Commissions are constitutional institutions meant to ensure merit-based appointments insulated from political pressures. A century after the Montagu–Chelmsford report envisaged them, State PSCs face credibility challenges due to recruitment irregularities and systemic inefficiencies that affect millions of aspirants.

    Why in the news?

    At the 2025 National Conference of Chairpersons of State Public Service Commissions hosted by Telangana PSC, members acknowledged recruitment controversies and demanded urgent reforms. Aspirant protests in Hyderabad highlighted how even minor delays disrupt youth livelihood prospects. Persistent exam cancellations and unclear syllabi have deepened mistrust despite PSCs’ constitutional mandate of meritocracy.

    Historical evolution of State PSCs :

    1. Montagu-Chelmsford Report :
      1. Recommended statutory recruitment bodies for welfare-oriented administration.
      2. Laid conceptual foundation for PSCs in India.
    2. First Public Service Commission (1926) :
      1. Set up for the Government of India before Independence.
      2. Marked beginning of institutionalised merit-based recruitment.
    3. Constitutionalisation through Article 315:
      1. Provided for separate Public Service Commissions for Union and States.
      2. Ensured autonomy and continuity post-Independence.

    Constitutional structure and organisation :

    1. Appointment and tenure of members: Governor appoints chairperson and members with fixed tenure and protected service conditions.
    2. Constitutional independence: PSCs function autonomously and discharge duties without executive interference.
    3. Role of UPSC in relation to State PSCs: UPSC may advise State PSCs on service matters when requested.
    4. Role of Ministry of Personnel: Helps maintain coherence in administrative policies across States.

    Present functioning and examination framework :

    1. Syllabus review mechanism: Periodic syllabus updates mandated to align with evolving administrative requirements.
    2. Question paper setting and evaluation: PSC sets papers, evaluates answer scripts and prepares selection lists.
    3. Cut-offs and result publication: Merit lists released after evaluation; criteria finalised by the PSC.

    Current challenges and bottlenecks

    1. Irregular recruitment cycles: Long gaps between notification and appointments disrupt careers and spark protests.
    2. Lack of transparency: Limited disclosure on answer keys and evaluation has lowered institutional credibility.
    3. Paper leaks and cancellations: Allegations of malpractice lead to cancellation, delays and erosion of public trust.
    4. Outdated syllabus issues: Poor syllabus revisions fail to reflect new governance themes and legal developments.
    5. Inconsistent standards across States: Divergent evaluation standards hinder mobility and generate inequality.

    Proposed reforms and restructuring measures:

    1. Revised manpower planning: Systematic vacancy forecasting to prevent examination delays.
    2. Fixed examination calendar: Annual, predictable and uniform recruitment schedule across States.
    3. Transparent evaluation policy: Mandatory disclosure of answer keys, normalisation criteria and cut-off logic.
    4. Academic and administrative alignment: Regular syllabus revision to match governance and administrative reality.
    5. Professional expertise induction: Inclusion of subject experts to improve paper quality and evaluation fairness.

    Conclusion

    State PSCs were created to provide equal opportunity in public employment. However, recruitment delays, unclear syllabi and opacity have damaged public trust. Ensuring predictability, transparency and institutional professionalism is essential to protect youth aspirations and restore confidence in constitutional recruitment bodies.

    PYQ Relevance

    [UPSC 2024] What are the aims and objects of the recently passed and enforced Public Examination (Prevention of Unfair Means) Act, 2024? Whether University/State Education Board examinations too are covered under the Act?

    Linkage: The Act directly links to the PSC crisis by targeting leaks, exam fraud and loss of trust in public recruitment. It sets a future-ready template for PSC reforms through transparency, deterrence and integrity in examinations.

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  • Freedom of Speech – Defamation, Sedition, etc.

    Guru Tegh Bahadur Ji: Martyrdom Day

    Prelims Only | History | Mains Paper 1: Modern Indian History,Salient features of Indian Society

    Why in the news?

    On the eve of the 350th Martyrdom Day of Guru Tegh Bahadur Ji, the President of India, Smt. Droupadi Murmu paid tribute to the ninth Sikh Guru, highlighting his supreme sacrifice for the protection of righteousness, humanity and freedom of faith.

    Who was Guru Tegh Bahadur?  

    • Ninth Guru of Sikhism (1621–1675).
    • Youngest son of Guru Hargobind Sahib, the sixth Guru.
    • Known as “Hind di Chadar” (Shield of India) for defending religious freedom.
    • Key teachings recorded in the Guru Granth Sahib, including hymns on detachment, courage, and equality.

    Why is His Martyrdom Significant?

    • Guru Tegh Bahadur opposed forced conversions under Mughal Emperor Aurangzeb.
    • He defended the rights of Kashmiri Pandits, who sought his protection.
    • Arrested and executed in Chandni Chowk, Delhi, on 24 November 1675.
    • His martyrdom represents:
      • Protection of freedom of conscience
      • Defence of pluralism and interfaith harmony
      • Upholding justice and truth

    President of India’s 2025 Message: Key Highlights

    • Tribute to his valour, sacrifice, and principles.
    • Emphasised his role in preserving: Righteousness, Humanity, Truth.
    • Called upon citizens to imbibe his values to strengthen harmony and unity in India.

    Guru Tegh Bahadur’s Contributions  

    • Spiritual Teachings: Advocated nirbhau (fearlessness) and nirvair (compassion). Stressed spiritual liberation through humility and service.
    • Establishment of Sikh Centres: Founded the city of Anandpur Sahib (1665). Travelled widely across the Indian subcontinent, spreading Sikh philosophy.
    • Guru Granth Sahib Contribution: Composed 116 hymns, including shaloks on detachment and moral courage.
    (2009) With reference to the cultural history of medieval India, consider the following statements: 

    1. Siddhas (Sittars) of Tamil region were monotheistic and condemned idolatry. 

    2. Lingayats of Kannada region questioned the theory of rebirth and rejected the caste hierarchy. 

    Which of the statements given above is/are correct? 

    (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2

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  • Hunger and Nutrition Issues – GHI, GNI, etc.

    Ultra-Processed Food Epidemic in India

    Prelims Only | Social Justice | Mains Paper 2: Health & Education

    Why in the news?

    A recent Lancet three-paper series highlights the rapid rise in ultra-processed food (UPF) consumption globally, including India, and its strong link to rising obesity, diabetes, cardiovascular diseases, and premature mortality. The case of an 18-year-old Indian youth with obesity and early-onset metabolic disorders illustrates the growing public health crisis.

    What are Ultra-Processed Foods?

    According to the NOVA classification, ultra-processed foods are:

    • Industrial formulations with multiple chemical and cosmetic ingredients
    • Made using high-fructose corn syrup, hydrogenated oils, flavour enhancers, emulsifiers, preservatives, colours
    • Designed for long shelf life, hyper-palatable taste and convenience
      Examples: Soft drinks, chips, packaged noodles, biscuits, sugary beverages, chocolates, breakfast cereals, frozen pizzas, ready-to-heat meals, chicken nuggets, processed meats.

    Difference from Processed Foods:
     Processed = minimal changes (washing, canning, cooking).
     Ultra-processed = heavy industrial formulations, low nutrients, high calories.

    Note: NOVA is a food classification system developed by the University of São Paulo (Brazil) that categorises foods based on the extent and purpose of industrial processing, not nutrients.

    India’s UPF Consumption – Why It’s a Concern?

    • Huge surge in consumption: Retail sales of UPFs in India jumped from USD 0.9 billion (2006) → USD 38 billion (2019) (approx. 40-fold increase).
    • Rising NCD (Non-Communicable Diseases) burden: As per ICMR–INDIAB (2023): Obesity: 28.6%, Diabetes: 11.4%, Prediabetes: 15.3%, Abdominal obesity: 39.5% and Childhood obesity rising: 2.1% → 3.4% (NFHS).
    A company marketing food products advertises that its items do not contain trans-fats. What does this campaign signify to the customers? (2011)

    1. The food products are not made out of hydrogenated oils. 

    2. The food products are not made out of animal fats/oils. 

    3. The oils used are not likely to damage the cardiovascular health of the consumers. 

    Select the correct answer using the code given below: 

    (a) 1 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3

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  • Air Pollution

    Thermal Power Plants Near Delhi Operating Without FGD

    Prelims Only | Enviro & Biodiversity | Mains Paper 3: Conservation, Environmental Pollution & Degradation, Eia

    Why in the news?

    Delhi’s air quality deteriorated sharply in November 2025. A major contributing factor identified is the continued operation of several thermal power plant units within a 300-km radius of Delhi without Flue Gas Desulphurisation (FGD) systems.

    What is FGD?

    Flue Gas Desulphurisation (FGD) is a pollution-control technology used in thermal power plants and industrial units to remove sulphur dioxide (SO₂) from exhaust flue gases before they are released into the atmosphere.

    Status of FGD Installation 

    Thermal Power Plants within 300 km of Delhi

    • Total plants: 11
    • Total units: 35
    • Units with FGD (as of Apr 2025): 13
    • Units without FGD: 22
    • Units currently operating without FGD (Nov 2025): 15
    • Units shut/reserve shutdown: 6

    States & Operators

    • Haryana (HPGCL): Panipat TPS, Yamuna Nagar TPS.
    • Punjab (PSPCL): Guru Hargobind TPS and Ropar TPS.
    • Private: Talwandi Sabo (Vedanta).

    Why SO₂ Emissions Matter?  

    • SO₂ converts into secondary PM2.5, the most harmful pollutant for human health.
    • Causes: Respiratory diseases, Acid rain and Visibility reduction (smog)
    • Travels long distances, affecting entire regions beyond plant boundaries.
    According to the Environmental Protection Agency (EPA), which one of the following is the largest source of sulphur dioxide emissions? (2024)

    (a) Locomotives using fossil fuels 

    (b) Ships using fossil fuels 

    (c) Extraction of metals from ores 

    (d) Power plants using fossil fuels

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